How to Upgrade Your 2600mAh Powerbank to 5000mAh





Introduction: How to Upgrade Your 2600mAh Powerbank to 5000mAh

This video shows you how to upgrade your 2600mAh powerbank to 5000mAh. This is for the popular 2600mAh keychain powerbank found in eBay. You don't need a rocket scientist brain to do this!!!! :P

Warning! quick solder on battery terminal. Li-Ion battery can explode when expose to heat for long period of time. Best is to discharge the battery and wear safety glass.

What you need?

1. Soldering iron and flux

2. 5000mAh 18650 battery ($10 or less in eBay)

3. Precision screw driver or pryer

Step 1: Open the cover by create a small opening at the side and then insert pryer or precision screw driver to gently snap open the cover.

Step 2: Remove the internal battery and the USB circuit board from the holder. Check and remember the terminal wire colour (red wire for + and black wire for -)

Step 3: Unsolder the wire attached to the internal battery. Then solder the wire onto the new battery. Make sure the terminal is correct.

Step 4: Check the circuit by charging it and charge a usb device. If all well, close the cover. If all fails, check the wiring.

There you go, you have upgraded your 2600mAh powerbank to 5000mAh.



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    Sir, I have single cell powerbank. If I add the Additional same type of cell(parallel) then it would be OK or it may left burnt up the PCB?

    Addin the batteries in parallel is ok but don't connect in series or serial.

    That means we can add multiple cells so that the capacity is increased, but dont its PCB has any load of it?

    only if you connect the batteries in parallel you will maintain

    hey mate i dont know why but i connected 4 old laptop battery in parallel checked voltage it was 3.7v and then as soon as i connected the connections went red hot and burnt. Pcb was saved but am not sure why it happened. Then i started testing with two and its still happening same why is that so. And yes i am connecting in parallel and checking voltage on multimeter

    Perhaps instead of parallel, you accidentally connected them antiparallel, i.e. plus to minus and minus to plus. This is actually a short circuited series connection, causing the maximum possible current to flow, as much as the cells will emit. However, between the common terminals, the voltage is close to 0V, so there was no electrical damage to charge controller.

    That the wires got red hot means that the cells took thermal damage too. Toss them away, you can no longer use them.

    Another possibilty is much less likely, that one of the cells gained high ESR and another low, due to repeated series charging without full balancing, causing a difference in apparent voltage when they were connected, which caused compensation currents to flow. But it's difficult, nearly impossible for that to occur at such currents as to heat up the connections red hot, because then ESR is current-limiting. What normally happens is that it either levels off or the battery depletes itself and becomes useless, but no extreme temperatures.

    I actually used thin wires and those heated up. After using multi stranded wire it worked good. Connections were good though.

    Only if you connect the batteries in parallel you will increase the capacity but maintain the same voltage as a single cell bat. Usually the PCB in powerbanks accepts about 3.7V which is about the same as 18650 bat.

    I dont think there is such thing as a 5000mah 18650 battery i think the highest 18650 battery would be 3000mah

    You are quite correct. The highest capacity 18650 size cells are approx. 3500-3600 mAh, made by Panasonic (ex Sanyo) and LG Chem. Which is honestly quite impressive already, i mean anything beyond approx. 1600-2000 is no longer terribly trivial, which is about how much you can expect from cells made by Chinese chemical companies, no matter how much they exaggerate.

    I'm not sure i'd take those cells of unknown origin even for free, i mean what it they grow a lithium dendrite inside and short out? There's still plenty of energy in there to make the consequences uncomfortable.